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Thanks, that solved the problem.

And obviously it had nothing to do with the Windows version.
I thought that I had examined every possible option, but apparently missed this one.

I seem to have a problem with saved sessions.

In the Compare window I create a few new sessions, each of which specifies a different set of directories, and has slightly
different comparison options (mainly filters, but that seems to be irrelevant for the problem).

Subsequently when I select these ...